Abstract
This paper describes friction characteristics of a water droplet on hydrophobic surfaces and effects of geometry of hydrophobic surfaces on friction are investigated. Sliding angle at which a droplet begins to fall down on a tilted surface and shear resistance of a droplet confined between two hydrophobic surfaces were measured. The results show, that on hydrophobic surfaces with small raised patterns, the sliding angle and the shear resistance are both small and symmetrical convex shape of the droplet is maintained during the sliding. The friction force between two hydrophobic surfaces is proportional to the peripheral length of the solid-liquid interface.
